<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <select onchange="chage()">
        <option>北上广</option>
        <option>港澳台</option>
        <option></option>
    </select>

    <script>
        function chage(){
            alert("啦啦啦");
        }
    </script>
</body>
</html>